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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I have a strange problem with my new PC. This is an ASUS P8z77-V LK mainboard, with Realtek 8111F Gigabit LAN Controller and Slackware 13.37 with 2.6.37.6 kernel.
The Internet connection was unacceptably slow and sometimes connection lost. So I started to monitoring what is happening and iptraf showed me the eth0 sending datas to eth0 through lo ???
But sometimes everything was ok, for a while it using the router then it using again the loopback.
I tried to disable lo but it not solved the problem because sometimes just nothing happening for a while, eth0 just waiting and waiting.
So now the symptom is eth0 is work for a short time then waiting for long time.
Is it could be a driver problem?

Additional information
This is a dual-boot system and if I boot Linux for first the network card is working normally (the sound is still not ok, but anyway).
So looks like the Windows set something for the network card and after a restart the Linux can not using it.
If I want to use Linux again I have to make a completely power-off until the MOBO's LEDs are off and after that start Linux.